Question

There are 3 panels pnlPanel0, pnlPanel1, pnlPanel2 with the same size and the same position.

With buttons “left” or “right” I need to change visibility of each panel.

With pnlPanel0 (contains labels) and pnlPanel2 (contains buttons) – OK.

But with pnlPanel1 (contains ListView):

curLayer == 1: after pnlPanel1.Visible = true;
panel with ListView is still invisible.

But if pnlPanel1 is not intersected with pnlPanel0 and pnlPanel2 – OK.

Why?

May be in this case is something wrong with “Bring to front”/”Send to back”?

Is there another safe and issue-free solution?

     if (curLayer == 0)
        {
            pnlPanel0.Visible = true;
            pnlPanel1.Visible = false;
            pnlPanel2.Visible = false;
        }
        else if (curLayer == 1)
        {
            pnlPanel0.Visible = false;
            pnlPanel1.Visible = true;
            pnlPanel2.Visible = false;
        }
        else if (curLayer == 2)
        {
            pnlPanel0.Visible = false;
            pnlPanel1.Visible = false;
            pnlPanel2.Visible = true;
        }

        MessageBox.Show(Convert.ToString(pnlPanel1.Visible)); // always false

.NET CF 3.5/WinForms/VS 2008/WinCE

Answer 1

I’ve got a form with about 7 Panel controls on it.

At Form_Load, all Panels are set to .Dock = DockStyle.Fill;.

Further, all Panels share this same GotFocus event:

private void ActivePanel_GotFocus(object sender, EventArgs e) {
  Panel pnl = sender as Panel;
  if (pnl != null) {
    pnl.BringToFront();
  }
}

Do you need to do something with a particular panel? OK, then take a look at this version:

private void ActivePanel_GotFocus(object sender, EventArgs e) {
  Panel pnl = sender as Panel;
  if (pnl != null) {
    pnl.BringToFront();
    if (pnl.Name == pnlPanel0.Name) {
      // Do something with pnlPanel0
    }
  }
}